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Biologists estimate that as many as 1,314 birds died at the Ivanpah Solar Electric Generating System (ISEGS) - a solar power tower project that also burns natural gas - from 25 May to 17 August 2015 based on partial searches of the sprawling facility. Many of the birds died from collision with giant mirrors or after flying through zones of intense heat above the project. The deaths last summer are in addition to thousands of others caused by the project since it was constructed.

During last summer at least two birds - a peregrine falcon and common raven - were severely burned by the project but still managed to fly close to the project's outer edge before dying, again suggesting that the study may underestimate the number of birds burned in the air space above the field of mirrors. The peregrine falcon was found in July and euthanized in September; the raven was found already dead.

According to a previous monitoring report, two other birds with burned feathers were found inciden…

Solar power tower developers have chided critical press coverage of their massive facilities as letting perfect be the enemy of good. But we have learned enough about this technology to know that power tower projects do not even qualify as "good" clean energy projects. Far superior alternatives exist in terms of life-cycle carbon emissions and sustainable siting.

Solar power towers have earned a bad reputation, and their developers are desperate to restore the green halo that they enjoyed a few years ago. NRG - the current owner of the Ivanpah Solar project in California - and Solar Reserve - owner of the Crescent Dunes project in Nevada - have long been on the defensive with inaccurate and misleading public relations efforts. But they have stepped up their PR efforts after new reports on their natural gas use and impacts on wildlife. Although developers promise to eventually deliver energy storage benefits, other technologies allow us to do so without burning birds in …